docs: def is_linuxbridge_interface(port):
      ''' Check if the interface is a linuxbridge bridge
      :param port: Name of an interface to check whether it is a Linux bridge
      :returns: True if port is a Linux bridge'''
  
      if os.path.exists('/sys/class/net/' + port + '/bridge'):
          log('Interface {} is a Linux bridge'.format(port), level=DEBUG)
          return True
      else:
          log('Interface {} is not a Linux bridge'.format(port), level=DEBUG)
          return False